Re: pg_ctl stop -m immediate on the primary server inflates sequences

Martijn van Oosterhout írta:
> On Sat, Apr 10, 2010 at 02:36:41PM +0200, Boszormenyi Zoltan wrote:
>   
>>>> The above is quite reproducable, "pg_ctl stop -m immediate"
>>>> "usually" inflated my serial sequence, but I had two occasions
>>>> when not. The 69 -> 70 was one. The inflated increase is always 33:
>>>>         
>>> AFAIKS sequences are pre-logged with 32 values to WAL to avoid
>>> overhead. I suspect this is why you are seeing those gaps.
>>>       
>> Then it should happen all the time, even with "-m fast" or "-m smart", no?
>>     
>
> Nope, because on a normal shutdown it writes out the actual value. When
> you say "immediate" you mean "right now, don't bother with anything not
> important", like for example gaps in sequences. You're essentially
> crashing the DB.
>
> Have a ncie day,
>   

OK, thanks for the info.

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Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
http://www.postgresql.at/